CN113783602B - Satellite communication data quality improving device - Google Patents
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Abstract
The invention discloses a satellite communication data quality improving device, which relates to a method for improving the data receiving quality in the satellite communication process, and is realized by the following technical scheme: the demodulation module carries out carrier wave and symbol tracking on the input intermediate frequency signal, and recovers the transmitted symbol information; the frame synchronization module completes the identification of the data frame; the descrambling module recovers the received data information; the decoding module carries out decoding processing and corrects errors introduced in the transmission process; the prior information adjustment module 1 corrects the output of the decoding module and sends the corrected output to the data application module for processing; the processed data is sent to a priori information adjustment module 2; correcting the remote sensing data according to the relation between the remote sensing data, feeding back to the decoding module for iteration again until the decoding result is checked to be normal or the iteration threshold times are reached, and improving satellite communication performance based on the joint judgment of multiple iteration operations of the decoding module.
Description
Technical Field
The invention belongs to the field of satellite communication, and particularly relates to a device for improving data receiving quality in a wireless communication process, which is particularly suitable for occasions such as satellite communication and satellite remote sensing, and particularly relates to a processing device for improving the wireless communication quality by using priori information in transmission data.
Background
With the continuous development and progress of social economy, satellite communication enters the life of people and continuously expands the application field. At present, the wireless communication through satellites can be used in various fields such as satellite television, communication technology, GPS technology, surveying and mapping, weather forecast and the like. These fields are all passed from one satellite system interface to another designated satellite system interface via satellite radio communication, during which many impeding factors affect the quality of satellite communication. Satellite communication is to transmit data to a satellite through a ground transmitting station by using high-frequency electromagnetic waves, and then transmit the data to a designated ground receiving station through the satellite, wherein the data of the satellite communication needs to reach the ground or the satellite through the atmosphere. The system is a birth of emerging technology, has strong connectivity, wide range, large capacity and multiple loading service types, and is convenient for life application of people, and the cost of transmission communication is irrelevant to the distance. However, there are many factors affecting satellite communication, mainly interference between adjacent satellites, interference caused by nonlinearity in transmission, and interference caused by system polarization, and even interference caused by equipment failure or misoperation will affect satellite communication quality. Factors affecting satellite communication quality mainly include interference generated by adjacent satellites; satellites can coexist with each other, but satellite networks between satellites interfere with each other. The communication orbits are similar due to the small distance between satellites. The magnitude of the interference is determined by the satellite antenna, and the greater the radiation of the antenna, the greater the interference. Most of the power radiated by the antenna is concentrated in the main lobe, the rest part of the power is transmitted by the side lobe, the received antenna receives the majority of the power by the main lobe, and the small part of the radiation is transmitted by the side lobe, so that the transmission quality of the adjacent satellite can be influenced by the transmission of the side lobe radiation.
Satellite remote sensing is an important technical means for acquiring the earth data information, and has the characteristics of no national boundary limitation, wide coverage area, periodicity, objective data and the like. The obtained remote sensing image data with high spatial resolution, high time resolution, high spectral resolution and high radiation resolution is subjected to basic processing and information extraction by a remote sensing image processing platform. With the development of satellite remote sensing technology, the resolution of remote sensing data is rapidly improved, and thus, the requirements on the data transmission rate and quality between the satellite and the ground receiving station are increasingly high. In satellite communication, bandwidth and power are two main limiting factors, on one hand, it is hoped to utilize limited bandwidth resources as much as possible, and improve the channel capacity of the system; on the other hand, it is desirable to transmit more information at lower transmit powers. The wireless communication channel is different from the wired channel, and the situation of the wireless communication channel is affected by rainfall, multipath, change of distance between the two sides of the signal transceiver, and the like. In order to improve the efficiency of satellite communication, conventional satellite communication generally meets the requirements of different transmission rates and transmission powers through different modulation and coding modes. In this way, for a single transmission task, the adopted coding and modulation modes often need to reserve more system margins, so as to ensure that normal transmission can be performed under severe link conditions such as rainfall, multipath, long-distance transmission and reception of signals. These power headroom are only occasionally used, and most of the time will be idle, resulting in serious waste of system resources. In order to improve the transmission efficiency of satellite communication, an adaptive transmission system for adjusting modulation and coding schemes in real time according to the transmission distance between the satellite and the earth and the change of the channel in one transmission task has been adopted in recent years. The adaptive transmission system can be adopted to more efficiently transmit data, so that limited bandwidth and power resources are fully utilized. The adaptive transmission can adjust the transmission mode in real time according to the channel quality: when the channel quality is poor, the transmission quality is ensured by reducing the modulation order, adopting coding modes with larger coding gain and the like; when the channel quality is better, the transmission rate is improved by means of improving the modulation order, adopting the coding rate with higher code rate and the like.
In the two modes, all transmission processes are to directly demodulate and decode received satellite signals, and some known information in the transmitted remote sensing data is not considered in the processing process, if the satellite ground station fully utilizes some known information in the remote sensing data in the receiving process, a new dimension can be introduced in the signal process, and the data receiving quality in satellite communication can be improved through the new dimension.
Disclosure of Invention
The invention aims at solving the problem that the prior satellite communication has insufficient utilization rate of known information such as frame synchronization words, version numbers, spacecraft identifiers, virtual channel identifiers, frame counts, known filling values/inserting values, association relations among the filling values/inserting values and the like in transmitted data, and provides a device for fully utilizing priori information, reducing interference and improving the quality of satellite communication data of communication transmission rate and communication data quality.
The invention solves the problems in the prior art by adopting the scheme that: the utility model provides a satellite communication data quality hoisting device, demodulation module, frame synchronization module, descrambling module, decoding module, priori information adjustment module 1, data application module and priori information adjustment module 2 who establishes ties in order, its characterized in that: the demodulation module carries out carrier tracking and symbol tracking on the input intermediate frequency signals, demodulates, frame synchronizes, descrambles and decodes the received wireless communication signals, and recovers the transmitted original data symbol information; the frame synchronization module performs phase ambiguity resolution, demapping and frame synchronization word searching on the demodulated symbol information to complete the identification of the data frame; the descrambling module performs descrambling processing on the data after frame synchronization is completed, and received data information is recovered; the decoding module carries out decoding processing on the descrambled data according to the constraint relation between the data during encoding, and corrects errors introduced in the transmission process; the prior information adjustment module 1 corrects the output of the decoding module according to the frame synchronization word, version number, spacecraft identifier, virtual channel identifier, frame count, known filling values/insertion values and the known information of the association relation between the frame synchronization word, version number, spacecraft identifier, virtual channel identifier, frame count and known filling values/insertion values in the transmitted data, feeds the corrected iteration data back to the decoding module for decoding, and sends the data after the decoding verification result is completely normal or reaches the maximum iteration number to the data application module for processing; the data application module applies the received data and sends the data to the prior information adjustment module 2; the prior information adjustment module 2 corrects the remote sensing data according to the relation between the remote sensing data, the corrected data is fed back to the decoding module to form large feedback, iteration is performed again until the decoding result is checked to be normal or the iteration threshold times are reached, and iteration is stopped after the satellite communication performance data quality is improved.
Compared with the prior art, the invention has the following beneficial effects:
the satellite communication data quality improving device is composed of a demodulation module, a frame synchronization module, a descrambling module, a decoding module, an priori information adjusting module 1, a data application module and an priori information adjusting module 2 which are sequentially connected in series, and fully utilizes known information such as a frame synchronization word, a version number, a spacecraft identifier, a virtual channel identifier, a frame count, a plurality of known filling values/inserting values and association relations among the known information, wherein the priori information is improved by adding the priori information adjusting module 1 and an iteration process in a traditional receiving flow, so that factors affecting satellite communication quality such as intermodulation interference, interference among channels and interference generated by system polarization are reduced, and the improvement of the received data quality is realized by means of the priori information.
The invention utilizes known information such as known frame synchronization words, version numbers, spacecraft identifiers, virtual channel identifiers, frame counts, known filling values/inserting values, association relations among the known filling values/inserting values and the like in the transmitted data to correct errors of the decoded data, and then carries out iteration of demodulation and decoding again, thereby improving the communication transmission rate. And finally, forming large feedback by utilizing the association relation of data in the image processing or other types of processing processes in the data application link to further improve the error rate, and in the process, the received data can be sent to a demodulation and decoding module for re-receiving after being subjected to error correction by means of artificial intelligence, large data analysis and other methods, and then the improvement of the data quality is obtained.
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The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic circuit diagram of a satellite communication data quality improving device according to the present invention.
Detailed Description
See fig. 1. In the preferred embodiment described below, a satellite communication data quality improving apparatus includes: the device comprises a demodulation module, a frame synchronization module, a descrambling module, a decoding module, an priori information adjustment module 1, a data application module and an priori information adjustment module 2 which are sequentially connected in series, wherein: the demodulation module carries out carrier tracking and symbol tracking on the input intermediate frequency signals, demodulates, frame synchronizes, descrambles and decodes the received wireless communication signals, and recovers the transmitted original data symbol information; the frame synchronization module performs phase ambiguity resolution, demapping and frame synchronization word searching on the demodulated symbol information to complete the identification of the data frame; the descrambling module performs descrambling processing on the data after frame synchronization is completed, and received data information is recovered; the decoding module carries out decoding processing on the descrambled data according to the constraint relation between the data during encoding, and corrects errors introduced in the transmission process; the prior information adjustment module 1 corrects the output of the decoding module according to the frame synchronization word, version number, spacecraft identifier, virtual channel identifier, frame count, known filling values/insertion values and the known information of the association relation between the frame synchronization word, version number, spacecraft identifier, virtual channel identifier, frame count and known filling values/insertion values in the transmitted data, feeds the corrected iteration data back to the decoding module for decoding, and sends the data after the decoding verification result is completely normal or reaches the maximum iteration number to the data application module for processing; the data application module applies the received data and sends the data to the prior information adjustment module 2; the prior information adjustment module 2 corrects the remote sensing data according to the relation between the remote sensing data, the corrected data is fed back to the decoding module to form large feedback, iteration is performed again until the decoding result is checked to be normal or the iteration threshold times are reached, and iteration is stopped after the satellite communication performance data quality is improved.
The transmitting end demodulation module performs down-conversion, filtering, carrier tracking and symbol tracking on the input intermediate frequency signal, recovers the transmitted symbol information and sends the symbol information to the subsequent frame synchronization module for frame synchronization; the frame synchronization module performs phase fuzzy search, demapping and frame synchronization word search on the symbol information sent by the demodulation module, completes phase fuzzy elimination and identification of frame synchronization words and data frames, and sends identification results to the descrambling module for descrambling; the descrambling module is used for carrying out descrambling processing on the data sent by the frame synchronization module and recovering encoded data information, and the information is sent to a subsequent decoding module for decoding processing.
The decoding module decodes the descrambled data information according to the constraint relation between the data during encoding, corrects transmission errors introduced in the transmission process, sends the decoded data to the prior information adjusting module 1, and simultaneously checks the decoding result and sends the checking result to the prior information adjusting module 1; after receiving the data and the decoding verification result sent by the decoding module, the prior information adjustment module 1 firstly checks the decoding verification result, and if the decoding verification result is correct, directly sends the data sent by the decoding module to the data application module; if the decoding verification result is incorrect, the data sent by the decoding module are adjusted according to known information such as a frame synchronization word, a version number, a spacecraft identifier, a virtual channel identifier, a frame count, a plurality of known filling values/inserting values, association relations among the known filling values/inserting values and the like in the sent data, and the adjusted data are sent to the decoding module again for decoding, and the process is repeated; after the decoding and checking result is correct or the maximum iteration number is reached, the prior information adjustment module 1 sends the data sent by the decoding module and the decoding and checking result to the data application module for processing; the data application module applies the received data and sends the processed original data and the decoding verification result to the prior information adjustment module 2; after receiving the original data and the decoding and checking result, the prior information adjusting module 2 firstly checks the decoding and checking result, and if the decoding and checking result is correct, the processing process is ended; if the decoding verification result is incorrect, the restored original data is adjusted according to the known information such as the association relation among the original data, and the adjusted data is sent to the decoding module again for decoding, and the process is repeated; and ending the processing after the decoding verification result is correct or the maximum iteration number is reached.
In the above processing procedure, since demodulation itself introduces phase ambiguity, the symbol information recovered here is phase ambiguity, and the phase ambiguity needs to be eliminated in the frame synchronization processing link by searching for the frame synchronization word under different phase ambiguities.
In the processing course, after the decoding module finishes decoding one frame of data, in the frame synchronization processing link, searching the frame synchronization word under different phase ambiguity, eliminating the phase ambiguity existing in the demodulation leading-in phase ambiguity and the recovered symbol information,
after the decoding module finishes decoding one frame of data, the decoding result of the frame of data is checked according to the constraint relation between the data during encoding, if the checking result is normal, the prior information adjusting module does not adjust the information, the iteration process 1 is stopped, the decoded data is directly sent to the data application module, the subsequent prior information adjusting module 2 does not adjust the data, and the iteration process 2 is stopped.
In the above processing procedure, in order to avoid the infinite iteration of the iteration process 1 and the iteration process 2, the decoding module increases the limit of the maximum iteration number in the iteration process 1 and the iteration process 2, and when the maximum iteration number is reached, the decoding module stops the iteration process and enters the next processing link no matter whether the verification result of the decoding module is correct or not. Typical values for the iterative process are 5-10 times.
In the processing process, the more the available priori information and the stronger the correlation between the priori information, the more obvious the effect of improving the quality of the received data.
The scope of the invention is not limited to the specific embodiments described. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Any technical solution obtained by carrying out the same or equivalent substitution of technical elements in the specific technical solution described or technical solution which can be obtained by a person skilled in the art without creative work on the basis of the specific technical solution described shall be considered as falling within the protection scope of the present invention.
Claims (6)
1. A satellite communication data quality improvement apparatus comprising: the device comprises a demodulation module, a frame synchronization module, a descrambling module, a decoding module, an priori information adjustment module 1, a data application module and an priori information adjustment module 2 which are sequentially connected in series, and is characterized in that: the demodulation module carries out carrier tracking and symbol tracking on the input intermediate frequency signals, demodulates, frame synchronizes, descrambles and decodes the received wireless communication signals, and recovers the transmitted original data symbol information; the frame synchronization module performs phase ambiguity resolution, demapping and frame synchronization word searching on the demodulated symbol information to complete the identification of the data frame; the descrambling module performs descrambling processing on the data after frame synchronization is completed, and received data information is recovered; the decoding module carries out decoding processing on the descrambled data according to the constraint relation between the data during encoding, and corrects errors introduced in the transmission process; the prior information adjustment module 1 corrects the output of the decoding module according to the frame synchronization word, version number, spacecraft identifier, virtual channel identifier, frame count, known filling values/insertion values and the known information of the association relation between the frame synchronization word, version number, spacecraft identifier, virtual channel identifier, frame count and known filling values/insertion values in the transmitted data, feeds corrected iteration data back to the decoding module for decoding, and sends the decoded data to the data application module for processing after the decoding verification result is completely normal or reaches the maximum iteration number; the data application module applies the received data and sends the data to the prior information adjustment module 2; the prior information adjustment module 2 corrects the remote sensing data according to the relation between the remote sensing data, the corrected data is fed back to the decoding module to form large feedback, iteration is performed again until the decoding result is checked to be normal or the maximum iteration threshold times are reached, and iteration is stopped after the satellite communication performance data quality is improved.
2. The satellite communication data quality improvement apparatus according to claim 1, wherein: the demodulation module firstly performs down-conversion, filtering, carrier tracking and symbol tracking on the input intermediate frequency signal, then recovers the transmitted symbol information, and sends the symbol information to the subsequent frame synchronization module for frame synchronization.
3. The satellite communication data quality improvement apparatus according to claim 1, wherein: the decoding module decodes the descrambled data information according to the constraint relation between the data during encoding, corrects transmission errors introduced in the transmission process, sends the decoded data to the prior information adjusting module 1, and simultaneously checks the decoding result and sends the checking result to the prior information adjusting module 1.
4. A satellite communication data quality improvement apparatus according to claim 3, wherein: after receiving the data and the decoding verification result sent by the decoding module, the prior information adjustment module 1 firstly checks the decoding verification result, and if the decoding verification result is correct, directly sends the data sent by the decoding module to the data application module; if the decoding check result is incorrect, the data sent by the decoding module is adjusted according to the frame synchronization word, version number, spacecraft identifier, virtual channel identifier, frame count, some known filling values/inserting values and the known information of the association relation between the frame synchronization word, version number, spacecraft identifier, virtual channel identifier and frame count in the sent data, and the adjusted data is sent to the decoding module again for decoding, and the process is repeated.
5. The satellite communication data quality improvement apparatus according to claim 4, wherein: after the decoding and checking result is correct or reaches the preset threshold of iteration times, the prior information adjusting module 1 sends the data sent by the decoding module and the decoding and checking result to the data application module for processing.
6. The satellite communication data quality improvement apparatus according to claim 5, wherein: the data application module applies the received data and sends the processed original data and the decoding verification result to the prior information adjustment module 2; after receiving the original data and the decoding and checking result, the prior information adjusting module 2 firstly checks the decoding and checking result, and if the decoding and checking result is correct, the processing process is ended; if the decoding verification result is incorrect, the recovered original data is adjusted according to the known information of the association relation between the original data, and the adjusted data is sent to the decoding module again for decoding, and the process is repeated; and ending the processing after the decoding verification result is correct or the maximum iteration number is reached.
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| CN114567341B (en) * | 2022-01-12 | 2023-05-23 | 中国电子科技集团公司第十研究所 | Multimode high-sensitivity high-speed signal receiving circuit |
| CN116232825B (en) * | 2023-04-28 | 2023-07-04 | 北京国电高科科技有限公司 | Information modulation and information demodulation methods and devices |
| CN117674977B (en) * | 2024-01-29 | 2024-04-16 | 中国卫通集团股份有限公司 | End-to-end simulation method and system for satellite communication physical layer |
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